Shuttle checking device for looms



Feb. 21, 1950 A. ZARN 2,498,022

SHUTTLE CHECKING DEVICE FOR LOOMS Filed Nov. 20, 1946 2 Sheets-Sheet l Inventor;

Adqlp/we Zar B5 @bkw ATTORNESS Feb. 21, 1950 A. ZARN' SHUTTLE CHECKING DEVICE FOR LOOMS 2 Sheets-Sheet 2 Filed NOV. 20, 1946 Inventor:

Adel Lake Zarn B.':{( Q J L ATTORNEHS ;in the working conditions,

'bufier having culties of a structural character.

Patented Feb. 21, 1950 F'IUNFITED STATES PATENT OFFICE 2,498,022 SHUTTLE CHECKING DEVICE FOR LOOMS Adolphe Zarn, Zurich, Switzerland Application November 20, 1946, Serial No.

In Switzerland November 21, 1945 1 Claim. (01. 139-166) ever, the shuttle, in consequence of variations the property of always adjusting itself automa 'cally to the necessary braking But even this construction met with diifirequirements penetrate behind the piston.

An object of the present invention is a particular construction of a buffer of the liquid displacement type, in a shuttle checking device for looms, by which the drawbacks of the known constructions of this kind are avoided. According to the invention, this is attained by the prodevice according to Fig.

vision above the piston packing which is constructed as a collar, and in the pump housing, of at least one valve for the passage of air. In this manner air forced into the housing by the movement of the piston at once escapes through a valve into the air space of the housing and cannot get behind the piston. There is furthermore preferably provided on the housing an inlet and excess pressure valve by which, in the first place, any possible excess pressure in the housing is avoided and, on the other hand air can .be introduced. In order to attain an absolute separation of the air and liquid, the pressure cylinder is connected by lower portion of the housing so that air cannever pass out of the air space into the pressure cylinder. Finally, as an alternative and in order not to weaken the cylinder wallswith an opening, the cylinder wall may be so constructed that it surrounds the piston With a clearance. The outflow of the liquid is thereby automatically throttled and the provision of a separate throttling. conduit is unnecessary.

On the annexeddrawing, various embodiments of the object of the invention are shown by way of example in Figs. 1 to 9.

Fig. 1 is a view of a shuttl checking device mounted on the end of a loom batten.

Fig. 2 is a plan view of the shuttle checking Fig. 3 .is a front view ofa shuttle checking device according to Fig. 1.

Fig. 4 is a vertical section through a shuttle checking device on an enlarged scale.

, Fig. 5 is a cross section on the line V V of Fig. 4;

Fig. 6 is a section according to Fig. 5 with a supplementary arrangement.

Fig. '7 shows a combined inlet and excess pressure valve on an enlarged scale.

Fig, 8 is a section on an enlarged scale illustrating a second embodiment of a shuttle checking device.

Fig. 9 is a section on the line IX-JX of Fig. 8.-

The end I of a loom batten shows in known manner a brake tongue 2. 3 indicates the picker on which the shuttle 4 strikes. On the loom batten I is mounted the checking device housing 5, the bulTer head 5 of which rests on the picker 3. As can be seen from Fig. 4, the buifer head 6 is connected with a piston 1 which is carried in a flange 8 and projects into the housing 5 of the checking devices. A sealing collar 9 forms a tight joint for the piston. There is an intermediate conduit with the portion to the speed of provided in the housing 5 a cylindrical body Ill having a ball valve H at its upper end directly over the collar 9. The cylindrical body H) has an intermediate conduit l2 which is projected almost to the bottom of the housing 5.

In the example according to Fig. 6, which differs from the example according to Figs. 4. and 5, there are provided .iurther partitions l3 which prevent the liquid from rising in the air space.

Fig. '7 shows a combined inlet and excess pressure valve which is mounted in the housing 5". The excess pressure valve M has a conical bore IS in which is arranged a body l6 working against the action of the internal excess pressure. The body l6 has a conical bore I8 on which a valve member i9 rests, the shank of which isfixed by a nut 20 on the plate 2| and which is under the action of the spring H.

The method of operation of this valve is clearly seen and requires no fuller explanation.

The method of operation of the embodiment according to Figs. 4 and 5 is briefly as follows:

On the movement of the piston 1 the liquid which is in the cylindrical body through the throttling conduit HJa. Thus, the speed of the piston I is braked according to the size of this conduit. Care, however, must be taken that the brake action is increased in prothe piston I, in other words, the greater the speed of the abutting shuttle. The braking stroke will consequently he the same at any speed of the shuttle and. this will come to a stop at the same position. Any air introduced by the reciprocating movement of the piston 1 into the housing 5 can pass through the valve ll into the upper space filled with air and consequently does not remain behind the piston and thus cannotaffect the working thereof.

Finally, the intermediate that air which is in the upper'part of the housing cannot pass into the cylinder filled with liquid.

In the example according to Figs. 8 and 9, in order to avoid the throttling conduitwhich weakens the construction other solution has been found. Here the piston -1 does not penetrate into a cylindrical body l0 surrounding it on all sidesbut the cylindrical body In embraces the piston l with a clearance so that the outflow opening or throttling conduit is formed by the clearance between the piston I and cylinder H]. Here, again, there is provided an intermediate conduit 12 in order to prevent the inflow of air into the cylinder.

Otherwise the example according 9 is the same as that according to to Figs. .8 and Figs. 4 and, 5.

H) is driven out conduit [2 ensures.

; the "example'according to Figs. adapt the checking device to of the cylindrical body, an 1 body substantially above The valve ll operates with every piston stroke due to the variation of pressure in said clearance; a small quantity of air or the like is pressed through the valve into the air-filled space of the casing; this is constantly replaced by the conveyance of oil out of the bottom of the casing, so that no more air can get into the cylinder body ID.

A further and not hitherto mentioned advantage of the. invention resides in that the device is adaptable in a simple manner for all eventual working conditions, in particular for all weights of shuttles. For it is sufficient to vary the throttle conduit accordingto the examples of Figs. 4 and 5 or the clearance between piston and cylinder in 8 and 9 in order to a different shuttle weightor to: other varied working conditions. In addition, however, there is also the possibility of filling the checking device with liquid of varying viscosity, whereby the same effect is attained. The same shuttle checking device can thus. in fact, be utilized for all working conditions by means of a few standard liquids of known viscosity. The adaptation can also take place not only by the manufacturingfirms, but also directly atplace of use by inexperienced labour.

I claim: A shuttle checking device 'for'looms, comprising a casing, a cylindrical body within saidcasing, a bufier head carried by said casing, a piston engaging said bufier head and adapted to penetrate into said cylindrical body with play'betweenthe piston and the cylindrical walls of said body, a sealing .collar enclosing said piston and located within said casing, a valve on said cylindrical said; collar for the withdrawal of air from said cylindrical body; and means forming a conduit connecting the interior of said cylindrical body with the bottom portion of the interior :of said casing, whereby air in-the interior of said casing is prevented from reaching the interior of said cylindrical body.

ADOLPHE .ZARN.

REFERENCES. CITED "The following references are of record in the file of this patent.

UNITED STATES PATENTS 

